Officials said that shots were fired Tuesday at a Washington state decommissioned nuclear power plant. However, no one was immediately able to locate the shooter or victims.

The Hanford Site is located about 20 miles northwest from Kennewick. Deputies raced to it, according to the Benton County Sheriff’s Office .

Managers at the site called Tuesday’s incident “possible active shooter”; they also said that employees are currently in lockdown mode.

Minutes after the initial statement by the sheriff, the department stated that deputies had not found any victims in the building and no evidence of shots being fired.

And at 12:48 p.m. CST. Department of Energy managers of Hanford said authorities “haven’t found any evidence of shots fired, or injuries.”

The DOE said that Hanford authorities were conducting interviews with employees who called in initial reports.

The site was established in 1943 and produced plutonium to support the top-secret Manhattan Project. This project led to the creation of atomic bombs that ended World War II.

It was closed down in 1987. Since then, has been a tourist destination.